US3921603A - Centrifugal fan cooling system - Google Patents

Centrifugal fan cooling system Download PDF

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Publication number
US3921603A
US3921603A US452117A US45211774A US3921603A US 3921603 A US3921603 A US 3921603A US 452117 A US452117 A US 452117A US 45211774 A US45211774 A US 45211774A US 3921603 A US3921603 A US 3921603A
Authority
US
United States
Prior art keywords
fan
radiators
axis
radiator
vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US452117A
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English (en)
Inventor
Erwin J H Bentz
Marvin G Getz
Roger A Stapf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Priority to US452117A priority Critical patent/US3921603A/en
Priority to JP50032882A priority patent/JPS50128022A/ja
Application granted granted Critical
Publication of US3921603A publication Critical patent/US3921603A/en
Assigned to CATERPILLAR INC., A CORP. OF DE. reassignment CATERPILLAR INC., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CATERPILLAR TRACTOR CO., A CORP. OF CALIF.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/10—Guiding or ducting cooling-air, to, or from, liquid-to-air heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/08—Arrangements of lubricant coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans

Definitions

  • ABSTRACT A centrifugal fan is disposed within a chamber formed in part by a pair of laterally spaced radiator cores and a horizontally mounted oil cooler with the centrifugal fan being effective for creating an air flow outwardly through the cores.
  • This invention relates to cooling systems and particularly to an arrangement of cooling coils around a centrifugal fan.
  • Axial flow fans are commonly used to improve the circulation of air through the radiators or heat exchangers of mobile vehicles. Such axial flow fans are quite satisfactory where the radiator capacity is rather large as compared to the size of the engine. However, the increasing horsepower used in suchvehicles today requires much greater cooling capacity and efficiency.
  • a pair of radiators and an oil cooler are arranged to form the sides and top of an enclosure in which is rotatably mounted a centrifugal fan.
  • the enclosure is open at one end corresponding to the end of the fan so that the fan generates-pressure within the enclosure which pressure forces air out through the respective radiators and oil cooler in a substantially even flow therethrough.
  • a further object of the present invention is to provide an improved arrangement of fan and radiators that is more compact and efficient than heretofore known systems.
  • Another object of the present invention is to provide a compact and efficient arrangement of cooling fan and radiators.
  • FIG. 1 is a side elevational view of a vehicle incorporating a preferred embodiment of the present invention
  • FIG. 2 is a rear elevational view of the embodiment of FIG. 1;
  • FIG. 3 is a side elevational view showing a portion of another vehicle incorporating an alternate embodiment of the present invention.
  • FIG. 4 is a front and elevational view of the embodiment of FIG. 3.
  • FIGS. 1 and 2 there is illustrated a centrifugal fan cooling system in accordance with the present invention generally designated by the reference numeral 10 incorporated in a vehicle 11.
  • the vehicle may be any suitable type such as earth moving vehicle as illustrated.
  • the vehicle includes. the usual operator station at 12 disposed substantially over the forward end of an engine indicated at 13 which is mounted toward the rear of the vehicle.
  • a transmission indicated at 14 is spaced to the rear of the engine and drivingly connected to the engine in the usual manner for transmission of power to the drive wheels and the track.
  • a power take-off pulley 15 is provided at the rear of the engine 13 for powering the fan of the cooling system.
  • the cooling system 10 is mounted above the transmission 14 and is enclosed within a protective enclosure 16 having a plurality of screen or grills 17, 18, 19, and 20, suitably arranged to facilitate air flow therethrough.
  • the cooling system includes a pair of laterally-spaced, vertically-oriented or disposed radiator cores 21 and 22 secured to a suitable mounting frame 23 such as by plurality of L-shaped brackets 24.
  • the mounting frame is rigidly secured to the vehicle frame not shown.
  • a horizontally disposed oil cooler 24 is secured between a pair of L-shaped brackets 26 which are in turn secured to the upper brackets 24.
  • the radiator cores, oil cooler and the top of the transmission are arranged to form or define an open ended chamber designated generally at 27.
  • the term radiator is used to refer to the radiators through which the engine coolant flows, and the term oil cooler is a radiator through which the engine oil or lubricant flows to be cooled.
  • centrifugal fan 28 is rotatably mounted within the chamber 27 between the vertical radiator cores 21 and 22 and below the oil cooler 25.
  • the fan is secured or mounted on a horizontal shaft 54 which is preferably disposed with its axis extending substantially along the same direction as the longitudinal axis of the vehicle.
  • a pair of transverse cross braces, one of which is shown at 29, are secured to the mounting frame 23 adjacent the end of the fan to provide mounting support for the fan and axle.
  • Each cross brace 29 is provided with a suitable bearing assembly 30 secured thereto for rotatably mounting the shaft 54.
  • a suitable pulley 31 is secured to the forward end of shaft 54 and is drivingly connected by suitable means such as a pair of V-belts 32 to the power take-off pulleys 15.
  • the driving connection between the engine and fan is such that when the engine is in operation, the fan 28 is rotated at arelatively high speed by the engine.
  • the fan draws air through the grill 17 into the center of the fan parallel to its axis and expels the air outwardly normal to the axis and through the radiator cores 21 and 22, and the oil cooler 25.
  • One of the desirable characteristics of the centrifugal fan is that it has good aerodynamic action in that air is rapidly accelerated and converted to pressure energy within the chamber 27.
  • the air is discharged by the fan into chamber 27 where it is slightly pressurized and is thereby forced to flow outwardly through the radiator cores and oil cooler utilizing the total surface area of these radiators. With the air flow substantially evenly distributed over the total of the radiator cores and oil cooler, considerably less turbulence is created in the air flow and thus noise level is lower.
  • FIGS. 3 and 4 An alternate embodiment of the invention is shown in FIGS. 3 and 4 wherein the engine 33 of the vehicle 34 is mounted toward the forward end of the vehicle.
  • a power take-off shaft or pulley 35 is provided at the forward end of the engine for driving the fan.
  • the centrifugal fan cooling system is mounted in front of the engine within a protective enclosure 36 comprising generally a front grill 37, side grills 38 and 39, and a top grill 40.
  • a pair of vertically disposed radiator cores 41 and 42 are disposed on either side of the fan and are secured to respective sidewalls of the protective enclosure such as by an upper L-shaped bracket 43 and a lower L-shaped bracket 44.
  • a plate 45 extends between lower brackets 44 and cooperates with the radiators and oil cooler to form an open ended chamber 46.
  • a horizontally disposed oil cooler 47 is disposed between the upper ends of the radiator cores 41 and 42 to complete the enclosure.
  • a centrifugal fan 48 is rotatably mounted within the enclosure and chamber defined by the respective radiators for rotation about an axis generally extending along the same direction as the axis of the vehicle.
  • the fan is preferably mounted on a horizontal shaft 49 which is suitably mounted in bearings 50 which are carried by cross braces 51.
  • the cross braces 51 extend across each end of the shaft at each end of the fan to support the fan.
  • a suitable pulley 52 is mounted on the rear of the shaft and connected by suitable means, such as a pair of V-belts 53, to the power take-off pulley 35.
  • This arrangement provides an arrangement wherein a very large radiator area may be utilized within a fairly compact space.
  • the compact space also permits the radiator area available to provide the function of a relatively large radiator.
  • the use of the centrifugal fan provides a relatively even flow of air through all of the radiator cores, thus providing a more even distribution of the heat exchange between the radiators and the flow of air.
  • the good aerodynamic characteristics of the arrangement provide a relatively quiet arrangement for high speed operation.
  • a cooling arrangement for vehicle engines comprising:
  • a centrifugal fan mounted on a vehicle for rotatio i about an axis substantially parallel to the longitudinal axis of said vehicle; a plurality of radiators mounted around said fan in planes substantially parallel to the axis of said fan, i
  • radiators for said engine coolant are vertically mounted on opposite sides of said fan; f said radiator for said lubricating oil is horizontally mounted above said fan; and, i said radiators forming a plurality of the sides of an from said fantravels outward through said radiators substantially evenly.
  • said grill assembly including frame means including cross members at the ends of said assembly;
  • a plurality of radiators including at least an oil cooling radiator and an engine coolant cooling radiator;
  • centrifugal fan mounted for rotation about an axis
  • the cooling arrangement of claim 4 including a grill assembly enclosing said radiators and said fan;
  • said grill assembly including frame means including cross members at the ends of said assembly;
  • a cooling arrangement for a vehicle comprising;

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
US452117A 1974-03-18 1974-03-18 Centrifugal fan cooling system Expired - Lifetime US3921603A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US452117A US3921603A (en) 1974-03-18 1974-03-18 Centrifugal fan cooling system
JP50032882A JPS50128022A (sv) 1974-03-18 1975-03-18

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US452117A US3921603A (en) 1974-03-18 1974-03-18 Centrifugal fan cooling system

Publications (1)

Publication Number Publication Date
US3921603A true US3921603A (en) 1975-11-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
US452117A Expired - Lifetime US3921603A (en) 1974-03-18 1974-03-18 Centrifugal fan cooling system

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US (1) US3921603A (sv)
JP (1) JPS50128022A (sv)

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4059080A (en) * 1975-01-23 1977-11-22 Motoren- Und Turbinen-Union Friedrichshafen Gmbh Engine compartment ventilating arrangement
US4086886A (en) * 1974-07-25 1978-05-02 Motoren- Und Turbinen-Union Friedrichshafen Gmbh Cooling installation
US4160487A (en) * 1976-12-31 1979-07-10 Veb Kombinat Fortschritt Landmaschinen Engine cooling system for an agricultural vehicle
US4377203A (en) * 1980-05-20 1983-03-22 Kabushiki Kaisha Komatsu Seisakusho Radiator equipped with a centrifugal fan
US4736727A (en) * 1986-07-01 1988-04-12 Navistar International Transportation Corp. Highway truck with charge air cooling
US5065814A (en) * 1990-11-01 1991-11-19 Terex Corporation Reduced noise modular cooling system
WO2000039438A1 (en) 1998-12-30 2000-07-06 Case Corporation Improved cooling system for an off-highway vehicle
US6129056A (en) * 1999-08-23 2000-10-10 Case Corporation Cooling system for work vehicle
US6145479A (en) * 1999-02-18 2000-11-14 Kohler Co. Vertical shaft engine cooling apparatus
US6179043B1 (en) 1999-05-27 2001-01-30 Caterpillar Inc. Heavy vehicle radiator with center-mounted hydraulic cooling fan motor and hydraulic motor oil cooler
US6321830B1 (en) 1999-12-15 2001-11-27 Caterpillar Inc. Cooling system for a work machine
US6401801B1 (en) * 1999-12-10 2002-06-11 Caterpillar Inc. Twin fan cooling system
US6427766B2 (en) * 2000-04-12 2002-08-06 Modine Manufacturing Company Equalization vessel for vehicular compact cooling systems
US6435264B1 (en) * 1998-08-21 2002-08-20 Komatsu Ltd. Cooling system for working vehicle
US6536382B1 (en) * 1999-04-19 2003-03-25 Seneca Technology Ltd. Radiator for inverted aircraft engine configuration
US6540036B1 (en) * 1999-10-07 2003-04-01 Kobelco Construction Machinery Co., Ltd. Construction machine
US20030066209A1 (en) * 2001-10-04 2003-04-10 Giiku Takezaki Engine compartment structure of a work machine
US6564857B1 (en) * 1999-10-21 2003-05-20 Modine Manufacturing Company Compact cooling system
US6585035B2 (en) * 2000-04-12 2003-07-01 Modine Manufacturing Company Transmission for driving a radial fan of a vehicle cooling unit
US6732681B1 (en) * 2003-02-19 2004-05-11 International Truck Intellectual Property Company, Llc Modular engine cooling system with hydraulic fan drive
US6749007B2 (en) * 2000-08-25 2004-06-15 Modine Manufacturing Company Compact cooling system with similar flow paths for multiple heat exchangers
US6832643B1 (en) * 1999-10-21 2004-12-21 Modine Manufacturing Company Cooling system, especially for a vehicle
US20050211487A1 (en) * 2004-03-29 2005-09-29 Kubota Corporation Work vehicle
US7128178B1 (en) * 1998-04-21 2006-10-31 Agco Gmbh & Co Vehicle cooling radiator arrangement
EP1741894A1 (en) * 2005-07-06 2007-01-10 Deere & Company Plenum cooling system, work vehicle and method
US20070193725A1 (en) * 2006-02-23 2007-08-23 Tri-X-Flo, L.L.C. Triangular shaped heat exchanger
US20110277973A1 (en) * 2010-05-17 2011-11-17 Foley Jason J Cooling Circuit With Parallel Radiators
US20120247752A1 (en) * 2011-04-01 2012-10-04 Agco Corporation Controller for work vehicle cooling package
US20120267082A1 (en) * 2011-04-21 2012-10-25 Equipment Technologies, Inc. Cooling system assembly for a crop sprayer
US20130228291A1 (en) * 2012-03-02 2013-09-05 Caterpillar, Inc. Replaceable Cooling System Compartment Door Screen Insert
US20140116658A1 (en) * 2012-10-30 2014-05-01 Deere & Company Vehicle cooling system
US20190017747A1 (en) * 2017-07-12 2019-01-17 Caterpillar Inc. Cooling assembly for service vehicle
US10876800B2 (en) 2018-07-12 2020-12-29 Abb Schweiz Ag Mechanical system with cooling apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1404304A (en) * 1919-08-29 1922-01-24 Int Motor Co Radiator
US1560694A (en) * 1922-07-07 1925-11-10 Int Motor Co Cooling system
US2204926A (en) * 1939-11-29 1940-06-18 George L Clingerman Motorbus construction
US2237497A (en) * 1939-09-14 1941-04-08 Munford William Taylor Air conditioner for automobiles
US2358663A (en) * 1941-08-20 1944-09-19 Rover Co Ltd Motor vehicle
US2524798A (en) * 1946-12-05 1950-10-10 Continental Thermotrol Inc Oil temperature control system for engines
US2597549A (en) * 1948-10-18 1952-05-20 Rech S Tech Et D Expl S Ind So Cooling device for engines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4410561Y1 (sv) * 1968-04-22 1969-04-28

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1404304A (en) * 1919-08-29 1922-01-24 Int Motor Co Radiator
US1560694A (en) * 1922-07-07 1925-11-10 Int Motor Co Cooling system
US2237497A (en) * 1939-09-14 1941-04-08 Munford William Taylor Air conditioner for automobiles
US2204926A (en) * 1939-11-29 1940-06-18 George L Clingerman Motorbus construction
US2358663A (en) * 1941-08-20 1944-09-19 Rover Co Ltd Motor vehicle
US2524798A (en) * 1946-12-05 1950-10-10 Continental Thermotrol Inc Oil temperature control system for engines
US2597549A (en) * 1948-10-18 1952-05-20 Rech S Tech Et D Expl S Ind So Cooling device for engines

Cited By (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4086886A (en) * 1974-07-25 1978-05-02 Motoren- Und Turbinen-Union Friedrichshafen Gmbh Cooling installation
US4059080A (en) * 1975-01-23 1977-11-22 Motoren- Und Turbinen-Union Friedrichshafen Gmbh Engine compartment ventilating arrangement
US4160487A (en) * 1976-12-31 1979-07-10 Veb Kombinat Fortschritt Landmaschinen Engine cooling system for an agricultural vehicle
US4377203A (en) * 1980-05-20 1983-03-22 Kabushiki Kaisha Komatsu Seisakusho Radiator equipped with a centrifugal fan
US4736727A (en) * 1986-07-01 1988-04-12 Navistar International Transportation Corp. Highway truck with charge air cooling
US5065814A (en) * 1990-11-01 1991-11-19 Terex Corporation Reduced noise modular cooling system
US7128178B1 (en) * 1998-04-21 2006-10-31 Agco Gmbh & Co Vehicle cooling radiator arrangement
US6435264B1 (en) * 1998-08-21 2002-08-20 Komatsu Ltd. Cooling system for working vehicle
US6216778B1 (en) 1998-12-30 2001-04-17 Case Corporation Cooling system for an off-highway vehicle
WO2000039438A1 (en) 1998-12-30 2000-07-06 Case Corporation Improved cooling system for an off-highway vehicle
US6145479A (en) * 1999-02-18 2000-11-14 Kohler Co. Vertical shaft engine cooling apparatus
US6536382B1 (en) * 1999-04-19 2003-03-25 Seneca Technology Ltd. Radiator for inverted aircraft engine configuration
US6179043B1 (en) 1999-05-27 2001-01-30 Caterpillar Inc. Heavy vehicle radiator with center-mounted hydraulic cooling fan motor and hydraulic motor oil cooler
US6129056A (en) * 1999-08-23 2000-10-10 Case Corporation Cooling system for work vehicle
US6540036B1 (en) * 1999-10-07 2003-04-01 Kobelco Construction Machinery Co., Ltd. Construction machine
EP1094288A3 (de) * 1999-10-21 2003-09-03 Modine Manufacturing Company Kühlanlage
US6886624B2 (en) 1999-10-21 2005-05-03 Modine Manufacturing Company Compact cooling system
US6832643B1 (en) * 1999-10-21 2004-12-21 Modine Manufacturing Company Cooling system, especially for a vehicle
US6564857B1 (en) * 1999-10-21 2003-05-20 Modine Manufacturing Company Compact cooling system
US6401801B1 (en) * 1999-12-10 2002-06-11 Caterpillar Inc. Twin fan cooling system
US6321830B1 (en) 1999-12-15 2001-11-27 Caterpillar Inc. Cooling system for a work machine
US6427766B2 (en) * 2000-04-12 2002-08-06 Modine Manufacturing Company Equalization vessel for vehicular compact cooling systems
US6585035B2 (en) * 2000-04-12 2003-07-01 Modine Manufacturing Company Transmission for driving a radial fan of a vehicle cooling unit
US6749007B2 (en) * 2000-08-25 2004-06-15 Modine Manufacturing Company Compact cooling system with similar flow paths for multiple heat exchangers
US6779591B2 (en) * 2000-08-25 2004-08-24 Modine Manufacturing Company Compact heat exchanger for a compact cooling system
US20030066209A1 (en) * 2001-10-04 2003-04-10 Giiku Takezaki Engine compartment structure of a work machine
US6732681B1 (en) * 2003-02-19 2004-05-11 International Truck Intellectual Property Company, Llc Modular engine cooling system with hydraulic fan drive
US7575081B2 (en) * 2004-03-29 2009-08-18 Kubota Corporation Work vehicle
US20050211487A1 (en) * 2004-03-29 2005-09-29 Kubota Corporation Work vehicle
EP1741894A1 (en) * 2005-07-06 2007-01-10 Deere & Company Plenum cooling system, work vehicle and method
US20070007061A1 (en) * 2005-07-06 2007-01-11 Deere & Company Plenum cooling system
US20070193725A1 (en) * 2006-02-23 2007-08-23 Tri-X-Flo, L.L.C. Triangular shaped heat exchanger
WO2007100595A3 (en) * 2006-02-23 2008-08-07 Tri X Flo L L C Triangular shaped heat exchanger
EP1987297A2 (en) * 2006-02-23 2008-11-05 Tri-X-Flo, Llc Triangular shaped heat exchanger
US7497250B2 (en) * 2006-02-23 2009-03-03 Tri-X-Flo, L.L.C. Triangular shaped heat exchanger
AU2007221336B2 (en) * 2006-02-23 2010-10-28 Tri-X-Flo, L.L.C. Triangular shaped heat exchanger
EP1987297A4 (en) * 2006-02-23 2012-07-18 Tri X Flo Llc HEAT EXCHANGER OF TRIANGULAR SHAPE
US20110277973A1 (en) * 2010-05-17 2011-11-17 Foley Jason J Cooling Circuit With Parallel Radiators
US20120247752A1 (en) * 2011-04-01 2012-10-04 Agco Corporation Controller for work vehicle cooling package
US8967239B2 (en) * 2011-04-01 2015-03-03 Agco Corporation Controller for work vehicle cooling package
US20120267082A1 (en) * 2011-04-21 2012-10-25 Equipment Technologies, Inc. Cooling system assembly for a crop sprayer
US8490730B2 (en) * 2011-04-21 2013-07-23 ET Works, LLC Cooling system assembly for a crop sprayer
US20130228291A1 (en) * 2012-03-02 2013-09-05 Caterpillar, Inc. Replaceable Cooling System Compartment Door Screen Insert
US8783398B2 (en) * 2012-03-02 2014-07-22 Caterpillar Inc. Replaceable cooling system compartment door screen insert
US20140116658A1 (en) * 2012-10-30 2014-05-01 Deere & Company Vehicle cooling system
US20190017747A1 (en) * 2017-07-12 2019-01-17 Caterpillar Inc. Cooling assembly for service vehicle
US10563925B2 (en) * 2017-07-12 2020-02-18 Caterpillar Inc. Cooling assembly for service vehicle
US10876800B2 (en) 2018-07-12 2020-12-29 Abb Schweiz Ag Mechanical system with cooling apparatus

Also Published As

Publication number Publication date
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Legal Events

Date Code Title Description
AS Assignment

Owner name: CATERPILLAR INC., 100 N.E. ADAMS STREET, PEORIA, I

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515

Owner name: CATERPILLAR INC., A CORP. OF DE.,ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515